- GitHub - apache/pdfbox: Mirror of Apache PDFBox
- pdfbox
- fontbox
- GitHub - itext/itext7: iText for Java represents the next level of SDKs for developers that want to take advantage of the benefits PDF can bring. Equipped with a better document engine, high and low-level programming capabilities and the ability to create, edit and enhance PDF documents, iText can be a boon to nearly every workflow.
- x-easypdf: 一个用搭积木的方式构建pdf的框架（基于pdfbox/fop）